PC GPUs are developed with collaboration with Microsoft, based on DirectX features, and if users of Khronos APIs are lucky they might eventually get them as extensions.

Steam Deck/Linux emulates DirectX and Windows, no need to bother with anything Linux native.

On Switch there is support for OpenGL 4.6, Vulkan and NVN, and just like on PC, if you want the full deal, NVN is the way to go.